Through its World Poll, Gallup can now report comprehensive and globally comparable income figures from 131 countries based on data collected from 2006 through 2012.
Gallup https://news.gallup.com/poll/166358/new-measures-global-income-gallup-world-poll.aspx
Gallup World Headquarters, 901 F Street, Washington, D.C., 20001, U.S.A
+1 202.715.3030